def add_two_numbers(a, b, c=10):
    return a + b

print(add_two_numbers(10,20))

def is_prime(n):
    if n <= 1:
        return False
    for i in range(2, int(n**0.5) + 1):
        if n % i == 0:
            return False
    return True

# for i in range(1, 101):
#     print(i)
#
# print(i)

print(is_prime(23))

# 递归实现阶乘
def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n - 1)

print(factorial(5))